[LyX/master] Math.lyx: add fallbacks for missing glyphs

commit 575e9d05c2d76af84001019b45d9640136fc07e7
Author: Juergen Spitzmueller <[email protected]>
Date:   Sun Mar 15 10:16:59 2026 +0100

    Math.lyx: add fallbacks for missing glyphs
    
    latinmodern with fontspec is missing combining cedilla
    with XeTeX, Å is missing as well
    
    This will fix some inverted tests
---
 lib/doc/Math.lyx    | 13 +++++++++++++
 lib/doc/de/Math.lyx | 13 +++++++++++++
 lib/doc/es/Math.lyx | 13 +++++++++++++
 lib/doc/fr/Math.lyx | 13 +++++++++++++
 lib/doc/ru/Math.lyx | 13 +++++++++++++
 5 files changed, 65 insertions(+)

diff --git a/lib/doc/Math.lyx b/lib/doc/Math.lyx
index cd1dfb9019..9557303e57 100644
--- a/lib/doc/Math.lyx
+++ b/lib/doc/Math.lyx
@@ -132,6 +132,19 @@
  {\usepackage{upgreek}
   \setboolean{upgreek}{true}}
  {\setboolean{upgreek}{false}}
+
+\usepackage{iftex}
+\iftutex
+  % latinmodern (used with non-TeX fonts) does not have a combining cedilla
+  % fake it (https://tex.stackexchange.com/a/164270/19291)
+  \def\c#1{{\setbox0=\hbox{#1}\ifdim\ht0=1ex \accent184 #1%
+    \else\ooalign{\unhbox0\crcr\hidewidth\char184\hidewidth}\fi}}
+\fi
+\ifxetex
+  % latinmodern (with XeTeX) does not feature Å
+  \usepackage{newunicodechar}
+  \newunicodechar{Å}{\AA}
+\fi
 \end_preamble
 \options bibliography=totoc,index=totoc,BCOR7.5mm,titlepage,captions=tableheading
 \use_default_options false
diff --git a/lib/doc/de/Math.lyx b/lib/doc/de/Math.lyx
index fe4c7f8ca8..529087fb0d 100644
--- a/lib/doc/de/Math.lyx
+++ b/lib/doc/de/Math.lyx
@@ -144,6 +144,19 @@
 % benötigt für Kommas in Formeln, siehe Kap. 22.3
 \IfFileExists{icomma.sty}
  {\usepackage{icomma}}{}
+
+\usepackage{iftex}
+\iftutex
+  % latinmodern (mit Nicht-TeX-Schriften verwendet) hat keine kombinierende Cedille.
+  % Baue sie nach (https://tex.stackexchange.com/a/164270/19291)
+  \def\c#1{{\setbox0=\hbox{#1}\ifdim\ht0=1ex \accent184 #1%
+    \else\ooalign{\unhbox0\crcr\hidewidth\char184\hidewidth}\fi}}
+\fi
+\ifxetex
+  % latinmodern (mit XeTeX) unterstützt Å nicht
+  \usepackage{newunicodechar}
+  \newunicodechar{Å}{\AA}
+\fi
 \end_preamble
 \options bibliography=totoc,index=totoc,BCOR7.5mm,titlepage,captions=tableheading
 \use_default_options false
diff --git a/lib/doc/es/Math.lyx b/lib/doc/es/Math.lyx
index fdc7b625bd..3718ffc869 100644
--- a/lib/doc/es/Math.lyx
+++ b/lib/doc/es/Math.lyx
@@ -131,6 +131,19 @@
  {\usepackage{upgreek}
   \setboolean{upgreek}{true}}
  {\setboolean{upgreek}{false}}
+
+\usepackage{iftex}
+\iftutex
+  % latinmodern (used with non-TeX fonts) does not have a combining cedilla
+  % fake it (https://tex.stackexchange.com/a/164270/19291)
+  \def\c#1{{\setbox0=\hbox{#1}\ifdim\ht0=1ex \accent184 #1%
+    \else\ooalign{\unhbox0\crcr\hidewidth\char184\hidewidth}\fi}}
+\fi
+\ifxetex
+  % latinmodern (with XeTeX) does not feature Å
+  \usepackage{newunicodechar}
+  \newunicodechar{Å}{\AA}
+\fi
 \end_preamble
 \options bibliography=totoc,index=totoc,BCOR7.5mm,titlepage,captions=tableheading
 \use_default_options false
diff --git a/lib/doc/fr/Math.lyx b/lib/doc/fr/Math.lyx
index f87be2806b..aa23c8f2c7 100644
--- a/lib/doc/fr/Math.lyx
+++ b/lib/doc/fr/Math.lyx
@@ -131,6 +131,19 @@
  {\usepackage{upgreek}
   \setboolean{upgreek}{true}}
  {\setboolean{upgreek}{false}}
+
+\usepackage{iftex}
+\iftutex
+  % latinmodern (used with non-TeX fonts) does not have a combining cedilla
+  % fake it (https://tex.stackexchange.com/a/164270/19291)
+  \def\c#1{{\setbox0=\hbox{#1}\ifdim\ht0=1ex \accent184 #1%
+    \else\ooalign{\unhbox0\crcr\hidewidth\char184\hidewidth}\fi}}
+\fi
+\ifxetex
+  % latinmodern (with XeTeX) does not feature Å
+  \usepackage{newunicodechar}
+  \newunicodechar{Å}{\AA}
+\fi
 \end_preamble
 \options bibliography=totoc,index=totoc,BCOR7.5mm,titlepage,captions=tableheading
 \use_default_options false
diff --git a/lib/doc/ru/Math.lyx b/lib/doc/ru/Math.lyx
index 4df4b17402..4a484b4afe 100644
--- a/lib/doc/ru/Math.lyx
+++ b/lib/doc/ru/Math.lyx
@@ -135,6 +135,19 @@
 % Use serif font
 \addtokomafont{disposition}{\rmfamily}
 \addtokomafont{descriptionlabel}{\rmfamily}
+
+\usepackage{iftex}
+\iftutex
+  % latinmodern (used with non-TeX fonts) does not have a combining cedilla
+  % fake it (https://tex.stackexchange.com/a/164270/19291)
+  \def\c#1{{\setbox0=\hbox{#1}\ifdim\ht0=1ex \accent184 #1%
+    \else\ooalign{\unhbox0\crcr\hidewidth\char184\hidewidth}\fi}}
+\fi
+\ifxetex
+  % latinmodern (with XeTeX) does not feature Å
+  \usepackage{newunicodechar}
+  \newunicodechar{Å}{\AA}
+\fi
 \end_preamble
 \options bibliography=totoc,index=totoc,BCOR7.5mm,titlepage,captions=tableheading
 \use_default_options false
-- 
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